Drop One is a waterfall in Imperial County, California. It sits roughly 25 km (15 mi) W of Donovan Estates.
Sunrise & sunset directions
At Drop One the sunrise point swings a long way through the year: about 61° (ENE) at the June solstice and 118° (ESE) in late December. Sunset moves from 299° (WNW) in June to 243° (WSW) in December, and the midday sun climbs to 81° in summer but only 34° in winter.
| Date | Sunrise | Azimuth | Sunset | Azimuth | Noon sun | Daylight |
|---|---|---|---|---|---|---|
| March equinox (Mar 20) | 6:44 AM | 90° E | 6:52 PM | 271° W | 57° | 12h 07m |
| June solstice (Jun 21) | 5:33 AM | 61° ENE | 7:51 PM | 299° WNW | 81° | 14h 18m |
| September equinox (Sep 22) | 6:29 AM | 89° E | 6:38 PM | 271° W | 58° | 12h 09m |
| December solstice (Dec 21) | 6:39 AM | 118° ESE | 4:38 PM | 243° WSW | 34° | 10h 00m |
Azimuth is measured clockwise from true north (90° = east, 270° = west). Computed for 2026; values change by less than a degree from year to year.
Golden hour & blue hour by month
Waterfalls photograph best in soft, even light: overcast days, deep shade, or the hour after sunrise before direct sun hits the water. Bright sun on white water blows highlights and adds harsh contrast.
| Month (15th) | Blue hour starts | Sunrise | Golden hour ends | Golden hour starts | Sunset | Blue hour ends | Daylight |
|---|---|---|---|---|---|---|---|
| January | 6:16 AM | 6:43 AM | 7:19 AM | 4:20 PM | 4:57 PM | 5:23 PM | 10h 14m |
| February | 5:59 AM | 6:24 AM | 6:58 AM | 4:52 PM | 5:26 PM | 5:51 PM | 11h 02m |
| March | 6:26 AM | 6:51 AM | 7:23 AM | 6:16 PM | 6:48 PM | 7:13 PM | 11h 57m |
| April | 5:45 AM | 6:11 AM | 6:44 AM | 6:37 PM | 7:10 PM | 7:35 PM | 12h 59m |
| May | 5:15 AM | 5:42 AM | 6:17 AM | 6:57 PM | 7:32 PM | 7:59 PM | 13h 50m |
| June | 5:04 AM | 5:32 AM | 6:09 AM | 7:14 PM | 7:50 PM | 8:18 PM | 14h 18m |
| July | 5:15 AM | 5:43 AM | 6:19 AM | 7:14 PM | 7:49 PM | 8:17 PM | 14h 06m |
| August | 5:38 AM | 6:04 AM | 6:38 AM | 6:53 PM | 7:26 PM | 7:52 PM | 13h 22m |
| September | 6:00 AM | 6:24 AM | 6:57 AM | 6:15 PM | 6:47 PM | 7:12 PM | 12h 23m |
| October | 6:20 AM | 6:44 AM | 7:18 AM | 5:35 PM | 6:08 PM | 6:33 PM | 11h 24m |
| November | 5:45 AM | 6:11 AM | 6:46 AM | 4:04 PM | 4:40 PM | 5:06 PM | 10h 29m |
| December | 6:08 AM | 6:35 AM | 7:13 AM | 3:59 PM | 4:36 PM | 5:03 PM | 10h 01m |
Local time (America/Los Angeles), including daylight saving time. Golden hour runs from about −4° to +6° solar altitude, so the morning golden hour begins during blue hour, before sunrise.
Milky Way & night sky
From Drop One, the Milky Way core is visible in a dark sky from February through October. June gives the longest window (about 6.2 hours on a moonless night), and the core peaks around 28° above the southern horizon. Our light-pollution model puts the sky at about Bortle 3 (rural sky), good enough for detailed Milky Way images.
| Month | Core visible (15th) | Hours | Max altitude | Direction |
|---|---|---|---|---|
| January | Below 10° in darkness | — | 1° | — |
| February | 4:09 AM – 4:59 AM | 0.8 | 17° | SE → SE |
| March | 3:20 AM – 5:20 AM | 2.0 | 25° | SE → SSE |
| April | 1:16 AM – 4:36 AM | 3.3 | 28° | SE → S |
| May | 11:17 PM – 3:57 AM | 4.7 | 28° | SE → SSW |
| June | 9:32 PM – 3:42 AM | 6.2 | 28° | SE → SW |
| July | 9:28 PM – 2:18 AM | 4.8 | 28° | SSE → SW |
| August | 8:56 PM – 12:16 AM | 3.3 | 28° | S → SW |
| September | 8:11 PM – 10:21 PM | 2.2 | 25° | SSW → SW |
| October | 7:30 PM – 8:20 PM | 0.8 | 17° | SW → SW |
| November | Below 10° in darkness | — | 3° | — |
| December | Below 10° in darkness | — | -18° | — |
Window when the galactic core is at least 10° high during astronomical darkness on the 15th of each month. Pick nights within a few days of the new moon. Plan exact nights with the Milky Way planner.
Estimated sky darkness: 3 Bortle 3 — Rural sky. Some light domes sit on the horizon, but the Milky Way still looks complex overhead. Modeled zenith brightness ≈ 21.53 mag/arcsec².
Weather & best season
Long-term NASA satellite data for this area show June as the clearest month (about 25% average cloud cover) and February as the cloudiest (40%). July is the warmest month and December the coldest, which matters for gear, snow access and how long batteries last at night.
Average cloud cover (%)
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 85 | 89 | 101 | 104 | 112 | 120 | 121 | 117 | 115 | 108 | 97 | 86 |
| Low °F | 24 | 27 | 35 | 41 | 47 | 56 | 67 | 65 | 55 | 43 | 31 | 29 |
| Precip. (in) | 0.5 | 0.5 | 0.4 | 0.1 | 0.1 | 0.0 | 0.5 | 0.5 | 0.5 | 0.2 | 0.4 | 0.4 |
Monthly climatology for the surrounding 1° grid cell from NASA POWER (MERRA-2). Mountain sites can be colder and cloudier than the cell average.
Photography tips for this waterfall
- Spring snowmelt and the days after heavy rain give the strongest flow; late summer flow can drop to a trickle.
- Look for a foreground: a mossy boulder, a fallen log or the creek's leading lines make a stronger frame than the falls alone.
- Keep a microfiber cloth handy — spray drifts onto the lens, especially at the plunge pool.
- Bracket shutter speeds: 1/8 s, 1/2 s and 2 s give very different water textures and you can choose later.
- Shoot RAW to keep the most latitude for high-contrast sunrise and sunset scenes.
Season: Peak flow is usually in late spring; autumn adds color around the falls, and winter can bring ice formations at colder locations.
Suggested gear: Tripod, Circular polarizer, 3–6 stop ND filter, Lens cloth, Waterproof footwear. Work out exposures with the depth of field, ND filter and NPF rule calculators.
Nearby photo spots
Other locations within 25 km of Drop One, closest first.
Campgrounds nearby (Recreation.gov)
FAQ
When is the best time to photograph Drop One?
What time is golden hour at Drop One?
Where does the sun rise and set at Drop One?
Can you see the Milky Way from Drop One?
Do you need a permit to photograph at Drop One?
How far is Drop One from Donovan Estates?
Sources
Location data: USGS GNIS / GeoNames. Sun, moon and Milky Way times are computed by LWPhoto Atlas for 2026. Climate: NASA POWER. Sky darkness is a population-based estimate (Walker's law), not a measurement. See data sources & licenses.